Gas cylinder cap



FIG. 1 is a perspective view of a gas cylinder cap;

FIG. 2 is a side view of the FIG. 1 cap;

FIG. 3 is a top view of the FIG. 1 cap;

FIG. 4 is a bottom view of the FIG. 1 cap; and,

FIG. 5 shows the FIG. 1 cap engaged with a gas cylinder.

The broken lines of FIG. 5 illustrate portions of the gas cylinder cap that form no part of the claimed design. 

CLAIM The ornamental design for a gas cylinder cap, as shown and described. 